Challenge not completing iis handler

[woody0130]

Running Windows 2012 R2

used powershell gallery to install

also installed ACMESharp.Providers.IIS

steps:

Initialize-ACMEVault

New-ACMERegistration .....

New-ACMEIdentifier -Dns www.ccimef.org -Alias ccimef2

Complete-ACMEChallenge ccimef2 -ChallengeType http-01 -Handler iis -HandlerParameters @{ WebSiteRef = 'CCIMEF' }

status will not change from pending:

(Update-ACMEIdentifier ccimef2 -ChallengeType http-01).Challenges

ChallengePart : ACMESharp.Messages.ChallengePart
Challenge : ACMESharp.ACME.HttpChallenge
Type : http-01
Uri : https://acme-v01.api.letsencrypt.org/acme/challenge/G43bhxXfonUJD7ZIWKeIVXE4V8nncO8Lscfa5Sb9MHk/4392804137
Token : Q1P0Qi8s52TxGW4Wxz1lPrtsIAVNrs0ft2e7C2L8hTk
Status : pending
OldChallengeAnswer : [, ]
ChallengeAnswerMessage :
HandlerName : iis
HandlerHandleDate : 4/27/2018 12:19:44 AM
HandlerHandleMessage : * Challenge response content has been written to local file path
at: [......\ccimef.org\.well-known/acme-challenge/Q1P0Qi8s52TxGW4Wxz1lPrtsIAVNrs0ft2e7C2L8hTk]
* Challenge response should be accessible with a MIME type of [text/json]
at: [http://www.ccimef.org/.well-known/acme-challenge/Q1P0Qi8s52TxGW4Wxz1lPrtsIAVNrs0ft2e7C2L8hTk]
* Local web.config has been created to serve response file as JSON
however, you may need to adjust this file for your environment
at: [http://www.ccimef.org/.well-known/acme-challenge/Q1P0Qi8s52TxGW4Wxz1lPrtsIAVNrs0ft2e7C2L8hTk]

HandlerCleanUpDate :
HandlerCleanUpMessage :
SubmitDate :
SubmitResponse :

ChallengePart : ACMESharp.Messages.ChallengePart
Challenge :
Type : dns-01
Uri : https://acme-v01.api.letsencrypt.org/acme/challenge/G43bhxXfonUJD7ZIWKeIVXE4V8nncO8Lscfa5Sb9MHk/4392804138
Token : 7U2kBXHsiHMMN6NTZOHh4G0LfFEFXprnFOPO5S39PNw
Status : pending
OldChallengeAnswer : [, ]
ChallengeAnswerMessage :
HandlerName :
HandlerHandleDate :
HandlerHandleMessage :
HandlerCleanUpDate :
HandlerCleanUpMessage :
SubmitDate :
SubmitResponse :

[woody0130]

I have also checked that the .well-known url responds via browser.

[woody0130]

Also, interesting change in output of Update-ACMEIdentifier for this alias today.
Notice that these three items have changed:

HandlerName :
HandlerHandleDate :
HandlerHandleMessage :

Compare below output to above:

(Update-ACMEIdentifier ccimef -ChallengeType http-01).Challenges

ChallengePart : ACMESharp.Messages.ChallengePart
Challenge :
Type : http-01
Uri : https://acme-v01.api.letsencrypt.org/acme/challenge/G43bhxXfonUJD7ZIWKeIVXE4V8nncO8Lscfa5Sb9MHk/4392804137
Token : Q1P0Qi8s52TxGW4Wxz1lPrtsIAVNrs0ft2e7C2L8hTk
Status : pending
OldChallengeAnswer : [, ]
ChallengeAnswerMessage :
HandlerName :
HandlerHandleDate :
HandlerHandleMessage :
HandlerCleanUpDate :
HandlerCleanUpMessage :
SubmitDate :
SubmitResponse :

ChallengePart : ACMESharp.Messages.ChallengePart
Challenge :
Type : dns-01
Uri : https://acme-v01.api.letsencrypt.org/acme/challenge/G43bhxXfonUJD7ZIWKeIVXE4V8nncO8Lscfa5Sb9MHk/4392804138
Token : 7U2kBXHsiHMMN6NTZOHh4G0LfFEFXprnFOPO5S39PNw
Status : pending
OldChallengeAnswer : [, ]
ChallengeAnswerMessage :
HandlerName :
HandlerHandleDate :
HandlerHandleMessage :
HandlerCleanUpDate :
HandlerCleanUpMessage :
SubmitDate :
SubmitResponse :